GS
Game Score
Game Score is a single-number rating of how well a batter or pitcher performed in a game. It blends the most meaningful parts of a box score — contact quality, run production, plate discipline, damage allowed or prevented, and workload — into one balanced index.
Higher is better. A strong Game Score means a player did the things that typically help a team win: hitters created runs and avoided unproductive outs; pitchers worked deep, limited baserunners, and kept runs off the board.
Team Game Scores on our reports combine all of a club's batting or pitching lines into one team total, then evaluate that combined performance as a unit — giving you a fair read on how the whole offense or staff performed, not just a headcount of individual standout lines.
IM
Impact
Impact measures how much a player's performance actually moved the needle in that game. Where Game Score reflects how well someone played, Impact reflects how much it mattered given the volume and context of their contribution.
A reliever who threw one perfect inning and a starter who carried a complete game can both post strong Game Scores — but their Impact numbers will differ based on how much they were involved and what they prevented or produced over their time on the field.
Team Impact totals sum each player's Impact across the roster. On the matchup board, Total Impact combines batting and pitching Impact for the team.
xR
OSB xR
OSB xR (Ohio Sports Brief expected runs) estimates how many runs a team should have scored in a game based on the quality and context of their offense.
It blends two signals: RE24, which captures the run expectancy added on each plate appearance given base-out state, and team Batting Impact scaled to a season-wide calibration factor (μ) derived from completed games across the season.
Compare Actual R to OSB xR on the matchup board to see which team over- or under-produced relative to the model. OSB xR is shown for batting offense only; Total Impact on the board includes pitching as well.
When Statcast RE24 coverage is limited for a game, or RE24 sequencing disagrees sharply with team Batting Impact, OSB xR falls back to the Impact-only estimate (hover the dotted value on the matchup board for details).
How to read a game report
- Matchup board — final score with team logos, Total Impact, and OSB xR for each club.
- Hit spray charts — interactive charts for each team showing singles, doubles, triples, and home runs on a generic ballpark map. Hover or tap a dot for player, inning, proportional PA Impact, and Statcast details when available.
- Impact comparison — team batting and pitching Impact totals side by side, plus Player of the Game awards.
- Side-by-side tables — every batter and pitcher in the game, ranked by individual Game Score.
- Team totals — Game Score is computed from combined team stats; Impact is the sum of individual player Impact values.
The exact weighting behind Game Score, Impact, and OSB xR is proprietary. The metrics are built to reward complete, winning baseball — not any single counting stat in isolation.